Heat-exchange apparatus



Sept. 3, 1929. E. N. SIEDER HEAT EXCHANGE APPARATUS Filed Oct. 26. 1928' Z w 4 m J A 5. 2 a Z 5 a 00 0o 00 Q00 00 .00 0600 Q0 8 @000 00 @o @009 00 oo, Q0 @9 0000 00 @Q 0000 00 8 0000 00 @Q 0000, 00 00 Patented Sept. 3, 1929.

v UNITED STATES PATENT OFFICE.

EVERETT NORMAN SIEDER, OE ELIZABETH, JERSEY, ASSIGNOR T FOSTER WHEELER CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

q HEAT-EXCHANGE APPARATUS.

Application filed October 26, 1928. Serial No. 315,285.

My invention relates to heat exchange apparatus and particularly to tubular heat exchangers wherein a plurality of. tubes are contained within a shell and are arranged to be removable therefrom. Still more particularly, my invention relates to heat exchange apparatus of the type comprising a stationary tube sheet and a floating tube sheet between which extend tubes, the tube unit being removable from the shell by pulling the tubes and floatinglhead attached through the shell and the s ell containing one or more baflies.

The object of my invention is to improve 1 the efiiciency of heat exchangers of the above described type. This is accomplished by decreasing flow of fluid past the baflie. Baflles have generally been made removable along with the tubes and have generally been attached to the stationary tube sheet. I fix the baflie within the shell, preferably welding it to the shell along all edges adJacent to the shell. The baflie is usually placed between groups of tubes. To remove the tubes as a unit, I split the floating tube sheet in line with the baflie. Where several baffles are used I may make several splits in this tube sheet. The arrangement is such that the parts of the split tube sheet are joined to form a unit tube sheet when assembled but so separated, when disassembled, as to permit being drawn through the'shell past the baflle.

The invention will be described in connection with the accompanying drawings showing several heat exchange apparati embodying my invention and whereon: 14 Fig.1 is aside view, partly in section of a heat exchange apparatus embodying the invention;

- Fig. 2 is a transverse cross-sectional view taken on the line 22 of ,Fig. 1;

Fig. 3 is a transverse cross-sectional view taken on the line 33 of Fig. 1;

Fig. 4 shows a part of a heat exchange apparatus embodying the invention in another form; and

Fig. 5 is a side view of a part of the heat exchange apparatus looking down on Fig. 3. Referring to the a paratus shown on Figs. 1, 2 and 3, a cylin rical extended shell 10 has end flanges 11 and 12. One fluid such as steam of low pressure is admitted to shell 10 through connection 13 and this fluid, which, if the apparatus is a condenser, becomes water, leaves shell 10 through connection 14. Attached to flange .12 is a stationary tube sheet 15 and attached to this tube sheet is a flange 9 of a casting or box 16, these parts being secured in adjacent fluid tight connection by bolts or other suitable means. End plate 17 is connected in the same manner to the main portion of box 16. Box 16 is provided with an inlet connection 19 and an outlet connection 20 for a second fluid,- such as water, designed to have exchange of heat with thefluid passing through connections 13 and 14. I

invention, this is a split tube sheet made of two halves or semi-tube sheets 22" and 22".

(See Fig. 2.) The tube bundle is composed of two groups of tubes spaced apart, of

.which one grouphis secured into the-semitube sheet 22 and the other into semi-tube sheet 22 by; expanding on the like into tube holes. Attached to one side of floating tube sheet 22 is a return channel ring 23 and to the other side a split backing ring 24. A cover 25 covers the end of return channel ring 23 to form a return channel 26 bounded by tube sheet 22, ring 23 and cover 25. Bolts 27 draw cover 25 against ring 23, and rings 23 and 24 against tube sheet 22. A bonnet 28 fits over parts 22, 23, 24, 25 and 27 and has a flange 29 which is bolted or otherwise suitably secured to flange 11. Suitable gaskets are preferably used in all jointsn The manner in which the two halves of split-tube sheet 22 areheld together is as follows: I

Within shell 10 is a bundle of tubes 21 of the semi-tube sheets can be placed against backing bar 30 and immediately;1

the backing bar. A corresponding bar 31 which I will term a retaining bar is formed integral with channel rin 23 and, when the parts are properly assem bled, lies opposite adjacent to the inside straight edges of t e semi-tube sheets. The tube sheet side of the retaining bar is likewise in the plane of the tube sheet side of the circumferential part of the chan-' nel ring. Semi-tube sheets 22 and 22 are not quite semi-circular but are slightly separated when assembled forming a crack between them. The straight edges are cut away, if necessary, to form spaces for passage of sultable size stud bolts 32 through the crack. The stud bolts pass through holes in the retaining bar, pass through the crack between the tube sheet halves and screw into the backing bar. Setting up on the bolts 32 serves to draw the retaining bar, semi-tube sheets and backing bar together, hold the semi-tube sheets together and seal the crack between the semi-tube sheets to prevent passage of fluld therethrough. Packing may be employed between the various parts.

Within the shell 10 is a longitudinal bafile 35 which is placed between the two groups of tubes. Baifie 35 is welded to the shell 10 along all of its longitudinal edges. It extends from fixed tube sheet 15 to a point some distance from backing ring 30.

Assuming that the heat exchanger shown is a condenser, the operation is as follows: Cooling water enters inlet 19 and passes through the lower group of tubes to return chamber 26 and thence through the upper group of tubes and out through connection 20. Steam enters connection 13, passes longitudinally in shell 10, around the upper tubes and above bafiie 35, thence around the end of bafile 35, between it and backing ring 30, thence longitudinally under baflle 35 around the lower group of tubes, and as condensate, out through connection 14.

Assuming that the heat exchanger shown in Fig. 1 is assembled as shown, I will describe how it is disassembled and from that description it will become evident how. the parts are assembled.

First, bonnet 28 is removed by removing I the boltsholding flanges 11 and 29 together.

3 account of stud bolts 32. These bolts are .then removed. Channel. ring 23 with retaining bar 31 then come off and as backing ring 24 is split as indicated at 36 in Fig. 3, the two halves of this ring including the two halves of backing bar 30 are readily removed. At the same time the two halves of tube sheet 22 have been made independent.

We now go to the other end of the heat exchanger and disconnect connections 19 and 20 from the associated pipes. Next the bolts holding flanges 9 and 12 and the tube sheet 15 are removed. This permits removal of box. 16. Tube sheet 15 is then pulled out endwise of shell 10 taking the tubes and floating head'22 with it. Baflie 35 is not connected to tube sheet 15 and remains in shell 10. Semitube sheets 22 and 22 are of such a size that they can pass through shell 10, one to each side of baffle 35. By using the arrangement of return channel ring 23 and backing ring 24 it is possible to have a floating tube sheet of less diameter than the inside diameter of shell 10. The crack between the semi-tube sheets may be considered as a passage for baffle 35.

It will be seen that the arrangement above described permits of welding bafiie 35 to shell 10 and thus short-circuitingof fluid past the longitudinal edges of the bafiie is prevented. Leakage past the end of the baflle adjacent tube sheet 15 is not nearly as great as would be the leakage past the longitudinal edges of the baflles if the baflie were attached and came out with the stationary tube sheet 15 as has been previous practice.

Fig. 4 shows another form of -the invention wherein the return channel ring and cover are combined into a unitary return channel member 39. The retaining bar extends to the cover position of member 39 and has one or more passages 40 for fluid through it. The type of floating head shown in Fig. 4 may be used with a four pass heat exchanger. Obviously the floating tube sheet may be split into more than twoparts as when it is desired to have more than one baflle such as 35.

It will be understood that the invention is not limited to the forms shown and that variations mav be made without departing from the spirit and scope of the invention.

What I claim is 1. In heat exchange apparatus, a split tube sheet and means for holding the parts of the tube sheet together.

2. Heat exchange apparatus comprising a shell, a baflle fixed within said shell, tubes within said shell on both sides of the bafiie,

a tube sheet at one end of said shell, said tube sheet being of substantially the same size as the cross-sectional area within said shell and said tube sheet being divided so that portions thereof may pass through the shell past the sides of the baflie, means for uniting the portions of the tube sheet, and a second tube sheet at the other end of said shell, said tubes being connected into said tube sheets.

3. Heat exchange apparatus comprising a shell, a tube unit within said shell comprising tubes and tube sheets at the ends of the tubes, abafiie within said shell between 5 groups of said tubes and means whereby the tube unit can be removed from the shell without removing the bafile.

4. A head for tubes comprising semi-tube sheets, a head member, a backing ring, means 10 for clamping the semi-tube sheets'between the head member and the backing ring, a retaining bar integral with said head member and a backing bar integral with said backing ring and means for clamping the retaining 15 bar and the backing bar together, with the ioining edges of the semi-tube sheets there etween, said retaining bar and said backing bar servin" to seal the joint betweenr the semi-tube s eets.

5. Heat exchange apparatus comprising a shell, tubes within said shell, a bafliefixed within said shell and a tube sheet connected to said tubes said tube sheet being split in longitudinal alignment with the bafile and to ether.

6. Heat exchange apparatus comprising a cylindrical shell, tubes within said shell, a

means for holding the partsof the tube sheet t 

